Just received this document from Robert Bashaw:
(23 Nov 08)
Police_Switch_Diagram.doc

Some good info on the switch is at:
http://www.my-mc.com/messages/1/33649.html

Honda PN 35150-MAJ-T31

Old text from a Group Buy done a while back:
"Actually, ‘Group Buy’ is a misnomer, as we can each individually order from him via:
http://www.casporttouring.com/store/merchant.mvc?Screen=CTGY&Category_Code=st1100_Hand-Cont
(it’s at the bottom)

If that link isn’t working, go to: http://www.casporttouring.com/
Click the big text link up top, “Click Here to Enter Our on-line Store!”
On the left, select “Browse by Make/Model”.
Select “Honda”.
Select “ST1100”.
Select “Handlebars/Controls”.
Scroll to the bottom to “ST1100 Right-hand multi-switch assembly, Code:HON-ST1100PSW”."